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The shotgun had been ground off, investigators sent the gun to forensic scientist timothy duerr. he knew that scratch marks usually weren't as deep as the original engraving. >> the serial number may only be a few thousandths of an inch, but the compressed metal goes a lot deeper into the metal. >> to restore the serial number, duerr applied an acid solution which only works at one level and goes no deeper. >> it will actually eat away and you can actually burn past the point of compression. it reacts differently between the compressed and uncompressed metal. the compressed being the serial nu...

The shotgun had been ground off, investigators sent the gun to forensic scientist timothy duerr. he knew that scratch marks usually aren't as deep as the original engraving. >> the serial number may only be a few thousandths of an inch, but the compressed metal goes a lot deeper into the metal. >> to restore the serial number, duerr applied an acid solution which only works at one level and goes no deeper. >> it will actually eat away and you can actually burn past the point of compression. it reacts differently between the compressed and uncompressed metal. compressed being the serial number....

>> since the serial number on the shotgun had been ground off, investigators sent the gun to forensic scientist timothy duerr. he knew that scratch marks usually aren't as deep as the initial engraving. >> the serial number may only be a few thousandths of an inch, but the compressed metal goes a lot deeper into the metal. >> duerr applied an acid solution that when applied only goes at one level and goes no deeper. >> it will actually eat away and you can actually burn past the point of compression. it reacts differently between the compressed and uncompressed metal. >> the acid solution remo...

Investigators sent the gun to forensic scientist timothy duerr. he knew that scratch markings usually aren't as deep as the initial engraving. >> the serial number may only be a few hundredths of an inch, but the compressed metal goes a lot deeper into the metal. >> an acid solution was applied which only goes at one level and goes no deeper. >> it will actually eat away and you can actually burn past the point of compression. it reacts differently between the compressed and uncompressed metal. >> the acid solution removed the top surface leaving the bottom or compressed metal virtually untouc...